Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bc2afdc86c6490…

MALICIOUS

PDF

68.6 KB Created: 2021-01-23 01:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f3c7452241cc44ca5168bc50475ae1c SHA-1: 7e878970a94ae50c4fff1a5abef1f07acff5cd0a SHA-256: 23bc2afdc86c64904eae4bf87e1f1ca6a2844f057b64a33ca24ce7ebb4ff052f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, indicating it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=silver+marten+netherland+dwarf PDF link annotation
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/dawodupozemu.pdfIn PDF document text
    • https://site-1233255.mozfiles.com/files/1233255/cerebrovascular_disease_journal.pdfIn PDF document text
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/texutuvewib_tuvobirovun.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/pulobox.pdfIn PDF document text
    • https://site-1176106.mozfiles.com/files/1176106/ax_3_domaines_prix_forfait.pdfIn PDF document text
    • https://site-1176842.mozfiles.com/files/1176842/voice_changer_for_discord_free_no_download.pdfIn PDF document text
    • https://zunitaxipef.weebly.com/uploads/1/3/1/3/131398356/9d03fabb7.pdfIn PDF document text
    • https://site-1249195.mozfiles.com/files/1249195/chakra_and_crystals.pdfIn PDF document text
    • https://cdn.sqhk.co/velomegu/iQhjTaD/the_crossing_church_columbia_mo_service_times.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/8002864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fe2567e02a7c.pdfIn PDF document text
    • https://site-1180908.mozfiles.com/files/1180908/56142521602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5ffab98a48c3a.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/puzadisewawe-vorew-fubofudo-xosexezopefit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5fce5f4d5582a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 5224 bytes
SHA-256: 202b8adc67e889f9b36ebd14d7cbcc2571fe6c6c515ff2146df7d49985a535eb
font_01_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 10476 bytes
SHA-256: 4ddab9c68486b032f41da3ec7588cafca9350675b05eb29017f4ce66fe229291

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